Q.

For the given incident ray as shown in figure, the condition of total internal reflection of the ray will be satisfied if the refractive index of block will be

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a

3+12

b

2+12

c

32

d

76

answer is C.

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Detailed Solution

rtθ=90o            θ=c                   r=90−cμ=sinisinr=12cosc
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For the given incident ray as shown in figure, the condition of total internal reflection of the ray will be satisfied if the refractive index of block will be